CN101767904A - Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method - Google Patents
Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method Download PDFInfo
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- CN101767904A CN101767904A CN 200910226635 CN200910226635A CN101767904A CN 101767904 A CN101767904 A CN 101767904A CN 200910226635 CN200910226635 CN 200910226635 CN 200910226635 A CN200910226635 A CN 200910226635A CN 101767904 A CN101767904 A CN 101767904A
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Abstract
The invention relates to a process for treating polluted groundwater of a retired mining area of an acid in-situ leaching uranium mine by using a microbial method. The process comprises the follow steps of: pumping the polluted groundwater of the retired mining area from draw holes, carrying out exchange adsorption to process uranium by using ion exchange resin, regulating the pH value of sewage solution to 7 approximately, allowing clear solution to enter a DNB bioreactor first, and reducing nitrate in the solution with DNB, wherein the removal rate of the nitrate is over 95 percent; and secondly, degrading sulfate and removing heavy metal ions of the solution in which the nitrate is degraded with a SRB bioreactor. The removal rate of the nitrate of the processed polluted groundwater is over 95 percent; the removal rate of the sulfate is between 60 and 70 percent, and the removal rate of the heavy metal ions is over 85 percent.
Description
Technical field
The present invention is directed to the characteristics of refractory reasons such as retired exploiting field, acid system ground-dipping uranium extraction mine polluted underground water principal pollutant nitrate radical, sulfate radical, uranium and heavy metal ion, propose a kind of DNB and SRB microbial association New Process for Treatment.
Background technology
Acid system ground-dipping uranium extraction technology is passed through the research and the application of recent two decades at home, and its industrial scale and production technique have obtained developing rapidly.China just the total all the people present in the ground-dipping uranium extraction mine of production run, all is acid system at present; No reagent leaches and (promptly adds CO
2And O
2) the technology industrial application builds; Soak neutrally with the alkaline process ground-dipping uranium extraction at present also in process of the test.External existing acid system also has alkaline process.According to various countries' uranium ore resource bury and the mineralogical composition characteristics are taked different process.Czech, Bulgaria etc. adopt acid system, and Pakistan, the U.S. adopt alkaline process, and Russia then adopts neutrality or low acidleach to go out.Acid system ground-dipping uranium extraction mine is through producing for many years, the stopping production that the production well site has, wait for retired, and just have new well site to need from now on every several years retired, the retired improvement of stopping production well site polluted underground water has become an extremely urgent problem, polluted underground water is administered with becoming restriction and is soaked the bottleneck of technical development, and particularly acid system ground soaks.
Because a large amount of sulfuric acid have been injected to containing the waterbearing stratum, ore deposit in process of production in acid system ground-dipping uranium extraction mine, when uranium is leached, other heavy metals are also dissolved to come out, cause underground water to form the severe contamination (see Table 1, table 2) of acid, uranium and other heavy metal, pollution element concentration surpasses ten times, tens times even hundreds of times.In addition, in drip washing technology, introduced nitrate radical, caused that nitrate radical exceeds standard in the underground water.The exploiting field that stopped production such as the untimely underground water that carries out are administered, and the groundwater pollution water body in exploiting field will be under the ordering about of natural flow field, constantly to around the diffusion migration, pollution range enlarges gradually, makes on every side groundwater environment suffer to pollute destruction.Therefore, acid system ground-dipping uranium extraction mine pollution underground water is administered, groundwater resource are difficult problems that need to be resolved hurrily around the protection.
Table 1 China acid system ground-dipping uranium extraction mine pollution underground water composition analysis result, mg.L
-1
| Composition | ??pH | ??SO 4 2- | ?NO 3- | ??U | ??Cu 2+ | ??Pb 2+ | ??Zn 2+ | ??Cr 3+ | ??Mn 2+ | ??Fe 3+ | ??M * |
| Adopt the back value | ??2.1 | ??3570.0 | ?～600 | ??16.0 | ??0.10 | ??0.37 | ??2.32 | ??0.30 | ??3.72 | ??412.0 | ??6410.0 |
| Background values | ??8.02 | ??372.5 | ?0 | ??0.63 | ??0.01 | ??0.05 | ??0.10 | ??0.005 | ??0.05 | ??0.41 | ??389 |
Underground water composition analysis average result after external certain the acid system ground-dipping uranium extraction mine of table 2 stops production, mg.L
-1
| Composition | ??pH | ??SO 4 2- | ??U | ??Cu 2+ | ??Pb 2+ | ??Zn 2+ | ??Cr 3+ |
| The result | ??1.8～3.0 | ??3000～17000 | ??3.0～20.0 | ??0.1～0.7 | ??0.12～1.65 | ??5.1～7.2 | ??0.16～5.1 |
| Composition | ??Al | ??NO 3 - | ??Cd 2+ | ??Fe 3+ | ??Mn 2+ | ??Se | ??M - |
| The result | ??1.8～3.0 | ??3000～17000 | ??3.0～20.0 | ??25～1100 | ??15～170 | ??0.05～5.0 | ??7500～21500 |
M
*: salinity
Water is administered research and is started from middle 1990s under China's acid system ground-dipping uranium extraction mine pollution, country has dropped into a large amount of funds, the correlative study institutes has carried out research for many years, main physics and the chemical purification method of adopting administered, as neutralization precipitation, ion-exchange, electrodialysis, reverse osmosis etc., though obtained certain progress.But because physics, chemical process cost height, technology are not perfect, enterprise is difficult to bear, and does not find technology, economically viable improvement method so far as yet, and the pollution exploiting field that has stopped production does not for many years begin to administer so far as yet.
Microbial treatment research still is in the starting stage in China, biological treating method with denitrifying bacterium (DNB) and sulphate reducing bacteria (SRB) combination treatment has its unique advantage, the DNB nitrate radical of can degrading not only, SRB reduces sulfate radical, make heavy metals such as Cu, Pb, Zn become the sulfide of indissoluble, make valence variation elements reduction such as U, V, Se, Mo and from water, separate out; Simultaneously can also make hydrolysis element co-precipitation such as Al, Cr, Mn, thereby polluted underground water is purified, and expense is also low than physics, chemical process, is an environmental type technology.
Summary of the invention
At principal pollutant in the polluted underground water of the retired exploiting field of acid system ground-dipping uranium extraction is nitrate radical, sulfate radical and characteristics such as uranium, heavy metal ion, adopts DNB and retired exploiting field, SRB combined governance acid system ground-dipping uranium extraction mine polluted underground water.Adopt DNB degraded nitrate radical earlier, adopt SRB degraded sulfate radical then, utilize the degraded product H of SRB
2S removes heavy metal ion, finally reaches the improvement purpose.
The retired exploiting field of DNB and SRB combined governance acid system ground-dipping uranium extraction mine polluted underground water technical scheme is: retired exploiting field polluted underground water is extracted out from taking out the hole, adopt ion exchange resin exchange adsorption treatment uranium, regulate about sewage pH value of solution value to 7, clear liquid at first enters the DNB bio-reactor, utilize DNB that nitrate radical in the solution is reduced, the nitrate radical clearance is greater than 95%; Second goes on foot, and the solution behind the degraded nitrate radical is passed through the SRB bio-reactor, degraded sulfate radical and removal heavy metal ion, and the sulfate radical clearance is 60～70%, the removal of heavy metal ions rate is greater than 85%.
The scheme flow process is: polluted underground water → adsorption treatment uranium → adjusting pH value → clear liquid enters DNB bio-reactor → enter SRB bio-reactor → injection underground reservoir.
Description of drawings
Fig. 1 DNB and the retired exploiting field of SRB combined governance acid system ground-dipping uranium extraction polluted underground water technical scheme schema.
Embodiment
The composition characteristics of retired exploiting field polluted underground water is: the pH value is about 2, and main pollutant component has uranium, sulfate radical, nitrate radical and heavy metal ion.Polluted underground water is extracted behind the face of land through ion exchange resin absorption out and is removed and reclaim uranium, then in and H
+, about regulator solution pH value to 7, remove part of sulfuric acid root and heavy metal ion, pass through DNB and SRB bio-reactor combination treatment nitrate radical and remaining sulfate radical, heavy metal ion at last.
Main pollution-producing content was SO before the somewhere was soaked and adopted the retired exploiting field of uranium mine polluted underground water and administer
4 2-: 13～15g.L
-1NO
3 -: 0.5～0.7g.L
-1U:5～10mg.L
-1Pb
2+: 0.2～0.5mg.L
-1Zn
2+: 2～5mg.L
-1Cr
3+: 0.2～0.5mg.L
-1Mn
2+: 2～5mg.L
-1After adopting such scheme that polluted underground water is administered, nitrate concentration is lower than 10mg.L
-1, clearance is greater than 95%; Sulfate concentration is 2～4g.L
-1, clearance is 60～70%; Uranium and removal of heavy metal ions rate are greater than 85%.
Through the application of this patented technology, the polluted underground water nitrate radical clearance after the processing is greater than 95%, and the sulfate radical clearance is 60～70%, and the removal of heavy metal ions rate is greater than 85%.
Claims (2)
1. microbial method is handled retired exploiting field, acid system ground-dipping uranium extraction mine polluted underground water technology, it is characterized in that retired exploiting field polluted underground water is extracted out from taking out the hole, adopt ion exchange resin exchange adsorption treatment uranium, regulate about sewage pH value of solution value to 7, clear liquid at first enters the DNB bio-reactor, utilizes DNB that nitrate radical in the solution is reduced; Second goes on foot, and the solution behind the degraded nitrate radical is passed through the SRB bio-reactor, degraded sulfate radical and removal heavy metal ion.
2. microbial method according to claim 1 is handled retired exploiting field, acid system ground-dipping uranium extraction mine polluted underground water technology, it is characterized in that the scheme flow process is: polluted underground water → adsorption treatment uranium → adjusting pH value → clear liquid enters DNB bio-reactor → enter SRB bio-reactor → injection underground reservoir.
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| CN 200910226635 CN101767904A (en) | 2009-12-15 | 2009-12-15 | Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043822A (en) * | 2012-12-28 | 2013-04-17 | 华北电力大学 | Ectopic pump circular processing system and method for reactive additives of tea saponin |
| CN107311269A (en) * | 2017-05-27 | 2017-11-03 | 中核通辽铀业有限责任公司 | A kind of method for reducing ground-dipping uranium extraction water-bearing layer containing ore deposit underground water pollution |
| CN107814362A (en) * | 2017-11-06 | 2018-03-20 | 宁夏中盛新科技有限公司 | A kind of method and device that sulfuric acid is reclaimed from nitrating wasting acid |
| CN109987676A (en) * | 2017-12-29 | 2019-07-09 | 新疆中核天山铀业有限公司 | Soak the application method that adsorption tower is recycled in mine uranium hydrometallurgy treatment process in ground |
| CN110951638A (en) * | 2019-11-28 | 2020-04-03 | 北斗星量子生物医药科技(深圳)有限公司 | Composite microbial agent for treating hazardous waste containing heavy metals and treatment method |
| CN112080638A (en) * | 2020-07-23 | 2020-12-15 | 衡阳师范学院 | Method for recovering uranium from uranium-containing wastewater |
| CN112875984A (en) * | 2021-01-12 | 2021-06-01 | 衡阳师范学院 | Treatment method of uranium ore wastewater |
| CN113248024A (en) * | 2021-04-26 | 2021-08-13 | 核工业北京化工冶金研究院 | Method for cooperatively treating acid-method in-situ uranium leaching underground water by using SRB and DNB mixed bacteria |
| CN114014463A (en) * | 2021-11-08 | 2022-02-08 | 核工业北京化工冶金研究院 | Underground water surface treatment method and ex-service treatment method of in-situ leaching uranium mining base |
| CN114684954A (en) * | 2020-12-31 | 2022-07-01 | 新疆中核天山铀业有限公司 | Reverse osmosis recycling method and device for uranium mine hydrochloric acid well-flushing waste liquid |
-
2009
- 2009-12-15 CN CN 200910226635 patent/CN101767904A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043822A (en) * | 2012-12-28 | 2013-04-17 | 华北电力大学 | Ectopic pump circular processing system and method for reactive additives of tea saponin |
| CN107311269A (en) * | 2017-05-27 | 2017-11-03 | 中核通辽铀业有限责任公司 | A kind of method for reducing ground-dipping uranium extraction water-bearing layer containing ore deposit underground water pollution |
| CN107814362A (en) * | 2017-11-06 | 2018-03-20 | 宁夏中盛新科技有限公司 | A kind of method and device that sulfuric acid is reclaimed from nitrating wasting acid |
| CN109987676A (en) * | 2017-12-29 | 2019-07-09 | 新疆中核天山铀业有限公司 | Soak the application method that adsorption tower is recycled in mine uranium hydrometallurgy treatment process in ground |
| CN110951638A (en) * | 2019-11-28 | 2020-04-03 | 北斗星量子生物医药科技(深圳)有限公司 | Composite microbial agent for treating hazardous waste containing heavy metals and treatment method |
| CN112080638A (en) * | 2020-07-23 | 2020-12-15 | 衡阳师范学院 | Method for recovering uranium from uranium-containing wastewater |
| CN114684954A (en) * | 2020-12-31 | 2022-07-01 | 新疆中核天山铀业有限公司 | Reverse osmosis recycling method and device for uranium mine hydrochloric acid well-flushing waste liquid |
| CN112875984A (en) * | 2021-01-12 | 2021-06-01 | 衡阳师范学院 | Treatment method of uranium ore wastewater |
| CN113248024A (en) * | 2021-04-26 | 2021-08-13 | 核工业北京化工冶金研究院 | Method for cooperatively treating acid-method in-situ uranium leaching underground water by using SRB and DNB mixed bacteria |
| CN113248024B (en) * | 2021-04-26 | 2022-03-01 | 核工业北京化工冶金研究院 | Method for cooperatively treating acid-method in-situ uranium leaching underground water by using SRB and DNB mixed bacteria |
| CN114014463A (en) * | 2021-11-08 | 2022-02-08 | 核工业北京化工冶金研究院 | Underground water surface treatment method and ex-service treatment method of in-situ leaching uranium mining base |
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Open date: 20100707 |